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Letters .Patent No. 73,897, dated January 28, 1868.

IMPROVEMENT IN BURGLAs-ALARM 'Locus'. I

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Bc it known that I, ALBERT IsENsEIt, of Indianapolis, in the county of Marion', and State'ot Indiana, have invented a new and useful Improvementin Burglar-Alarms Connected with a-Doo1-Lock; and I do hereby declare that the `following is a full, clear, and exact description of the same', reference being had to the annexed drawings, in whicliv i l Figure 1 is a side elevations-bowing the internal mechanism of alock.

Figure 2 is an elevation .of the holt.

Figure 3 is an elevationof the sliding tumbler.

Figure 4,' a. similar-elevation of another plate.

Figure 5 is an elevation of one ofthe keys.

Figure 6, alplan View of the key, shown in iig.l 5.

Figure 7, a side elevation of another key.

Figure 8 is a pla-n of the same.

Figure 9 is an elevationof the alarm-mechanism.

Figure 10 is an elevation of the alarm-set.

Figurerll is a perspective -view of the bell; and' Figure 12 is a section of the'same.

The same letters are employed in the indication of identical parts in all the figures.

A is ,the case of the lock, and B is the bolt, which is formed as shown in g..2. B is an arm projecting from the top of' the bolt and supporting the stem B2. This stem is surrounded by the spiral spring C placed between the-arm B1 and ,a projection, D1, from the sliding tumbler D, `the form of which is shown in iig. 3. The slot at D2 receives the pin H, ou which is hinged the oscillating tumbler E, the form ofwhich is shown in fig.. 1. F is a spring, acting on the tumbler E, the other end bearing against the projection A2,: a. similar spring, D3, acting 011 the sliding tumbler D, resting against another projection, Al, on the case A. G is an intermediate stationary plate between the bolt and tum ler E.v I have shown but oue,oscillating tumbler; the number may ber increased at will. The piu'Biprojecting from the bolt B, passes through the slots .l1 and G1 in the tumbler and intermediate pla-te. I is an arm, projecting from the sliding tumbler D through an opening in the end of the case A. This arm aetuates the alarm-mechanism, in a manner to be explained hereinafter.

Iuse two keys, shown in figs. 5 and 7, of which lig. 5 represents the inside key, and iig. 7 the outside key, marked respectively L and K. These keys are, in construction, the reverse of oneanother. K1 and L arebits attached to the side-ot` the stem of the key.'- M is the key-hole passing through the case A.

The operation of this lock isv as follows: When the bolt is retracted it is held by thepin B3, in the notch vE3 in the' end of the Lslot El. The key being inserted,`say the inside key L, the wardIi2 will, as the key is turned, disengage the bolt by raising the tumbler E. The ward Lvacting against the bolt,'will\then throw it forward one-half its throw, when the bit IE, coming into action, throws thebolt toits entire projection. The bolt carries with it the sliding tumbler D, and when the bolt is fully thrown, the spring D3, pressing the tumbler downward, the projection A3 will catch against the notch D4 in the tumbler D. rThis notch will' prevent the bolt from being pressed back entirely, as does also the projection E2 above the slot El. The bolt will, howeverfpiay betweenthe vend oi theslot E1 andthe projection F2, being presse-d outwardly by the spring In unlocking, the bit L1 rst moves the bolt back until the ward L? comes' into action, when the wards Iii und L4, acting respectively on the tumblers D and E, engage them from the pin B3 and the projection A3, and. permit the bolt to be completely retracted.

As the sliding tumbler accompanies the bolt in its movement, the alarm-mechanism having been set when the bolt was thrown, it will be'put into action -by the arm I striking -against a trigger. If a burglar 4should throw the bolt half back by a hook, he must next raise the tumblers. If he raises the tumbler D, disengaging the notch D4, the spring at once'pushes back the tumbler D and arm I, and starts the alarm. If he raises the tumbler E it will strike'againt the projection D5, and Athus raise'the tumbler D,- and produce the same effect.

lvThe''following is a description' of the alarm: I have shown in fig. 9 one arrangement of clock-work. This maybe of any ordinary arrangement, and need not be described. Tbhe alarm is enclosed within the bell N, and

the hammerstrikes against the projection N1, on the inner surface of the bell adapted to receive it. O is the trigger, attached to the double clutch R, by which the action of the spring on the clock-work is prevented until it is released by touching the trigger. l? is the alarm-set. It is o. plate with a slot, through which .passes a stem, P1, on which the plate slides. The head is bevellecl'on the sides, and it has anotch, P2, as shown in 6g. 10. The lower end of the trigger is bent' at right angles, and is received into the notch P2 when tlze set I? is v raised. Theibolt being withdrawn, the hooked end of the arm I will stand behind the trigger, the arm passingl under the same. Now press up the set P and push the trigger into the notch P2 holding it up; tire clock may he wound up, the set keeping the clutch in the toothed wheel Q. When wound up,rby throwing the bolt with the key, the trigger' will be carried out of the notch in the set P, and engaging the lower end ofthe doubleclutch, which is shown at R, in iig. 9, by dotted lines. When the notch IZ is disengaged, the plate I will fall, andas the actionv of the alarm i's now only prevented `by the hook on the arm I, as soon as the bolt is thrown back or the tumblerv I) raised, as explained, the arm I disengagiug the trigger, the alarm will be sounded.

What I claim as my inventiomand desire to secure byvLetters Patent, is v 1. The sliding tumbler D and arm I, arranged to operate in combination with the bolt B, substantially in the manner. and for the purpose set forth. i

2. The set l?, incombination with the trigger- 0, substantially as and for the purpose set forth. j In testimony whereof, I have signed my'name to this specication in the presence of two subscribing witnesses:

i ALBERT ISENSEE.

Witnesses JOHN S. HOLLINGSHEAD, R. MASON. 

